Teams can keep standing areas for three seasons if they stay up from league one, for example Yeovil still have standing but they are going back down so they are keeping it
http://www.bbc.co.uk/sport/0/football/26141427
League One Bristol City plan to become the first club in the UK to install safe standing rail seats.
As part of the redevelopment of Ashton Gate this summer, the club intend to install the new seating in two stands.
EDIT: Amex to become safe...